package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.LOGIN_USER_KEY;
import static com.hmdp.utils.RedisConstants.LOGIN_USER_TTL;

public class RefreshTokenInterceptor implements HandlerInterceptor {

	private StringRedisTemplate stringRedisTemplate;

	public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate) {
		this.stringRedisTemplate = stringRedisTemplate;
	}

	@Override
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
		// 1.获取请求头中的token
		String token = request.getHeader("authorization");
		if (StrUtil.isBlank(token)) {
			return true;
		}
		// 2.基于TOKEN获取redis中的用户
		String key  = LOGIN_USER_KEY + token;
		Map<Object, Object> userMap = stringRedisTemplate.opsForHash().entries(key);
		// 3.判断用户是否存在
		if (userMap.isEmpty()) {
			return true;
		}
		// 5.将查询到的hash数据转为UserDTO
		UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);
		// 6.存在，保存用户信息到 ThreadLocal
		UserHolder.saveUser(userDTO);
		// 7.刷新token有效期
		stringRedisTemplate.expire(key, LOGIN_USER_TTL, TimeUnit.MINUTES);
		// 8.放行
		return true;
	}

	@Override
	public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
		// 移除用户
		UserHolder.removeUser();
	}
}